哈雷彗星的尘埃与银河
影像来源与版权:Gang Li

说明:5月7日,宇宙尘埃的颗粒划过几乎没有月亮的夜空。地球在周期彗星哈雷彗星遗留下的碎片流中穿过,这个一年一度的流星雨被称为宝瓶η流星雨。虽然这幅合成影像是在流星雨达到极大期后一天拍摄的,但是它仍在2个小时的曝光时间内捕捉到20颗流星,并呈现在天空背景曝光影像中。从澳大利亚悉尼以南100公里处看去,流星余迹指向的辐射点靠近地平线,是与流星雨同名的暗星宝瓶座η星。以速度著称的宝瓶η流星移动速度很快,以每秒66公里的速度进入大气层。明亮的木星在地平线上空、银河系的中央凸起处闪耀。南十字正好位于这幅影像的右上角。
翻译:北京天文馆

Halley Dust and Milky Way
Image Credit & Copyright: Gang Li

Explanation: Grains of cosmic dust streaked through the mostly moonless night skies of May 7. Swept up as planet Earth plowed through the debris streams left behind by periodic Comet Halley, the annual meteor shower is known as the Eta Aquarids. Though it was made about a day after the shower’s predicted maximum, this composite image still captures 20 meteors in exposures taken over a 2 hour period, registered on a background exposure of the sky. The meteor trails point back to the shower radiant near eponymous faint star Eta Aquarii close to the horizon, seen from 100 kilometers south of Sydney Australia. Known for speed, Eta Aquarid meteors move fast, entering the atmosphere at about 66 kilometers per second. Brilliant Jupiter shines near the central bulge of the Milky Way high above the horizon. The Southern Cross is just tucked in to the upper right corner of the frame.
Astronomy Picture of the Day 05/10/2019